http://mmajunkie.comAlthough simple addition proved to be the biggest foe of Demetrious Johnson (14-2-1 MMA, 2-1-1 UFC) and Ian McCall (11-2-1 MMA, 0-0-1 UFC) at UFC on FX 2, both flyweights have admitted to serious mistakes in their first meeting.

For Johnson, it was a mistake in dietary preparation that left him without the steam to compete past 10 minutes.

For McCall, it was old demons that removed him from the action taking place before him.

Both claimed to have made adjustments leading into tonight’s rematch at “UFC on FX 3: Johnson vs. McCall.” But will it change the fight?

The event takes place at BankAtlantic Center in Sunrise, Fla. Main-card fights air live on FX while FUEL TV and Facebook carry the prelims.

The night’s main event serves as a do-over of the opening round of a four-man flyweight tournament, which the UFC put together to announce the arrival of the new division. The original bout, which took place March 3 at UFC on FX 2, originally was announced as a split decision in favor of Johnson. But later it was found to be a majority draw when officials discovered that scorecards had been incorrectly tabulated.

The winner of tonight’s fight meets finalist (and onetime bantamweight challenger) Joseph Benavidez at a date to be determined.

Johnson told MMAjunkie.com (www.mmajunkie.com) that after neglecting to eat carbs in the buildup to UFC on FX 2, he’s changed his diet and will have the energy that he did early in the first fight, but not in the final round. If that means the third round will look like the first and second, as he said Wednesday during open workouts for Friday’s event, that means a few things:

1. He’ll have a striking advantage. Expertly closing distance and retreating, Johnson kept McCall off his rhythm with leg kicks early on in the first fight. He landed quick combinations before peeling off. McCall caught him a few times, but Johnson racked up points with a few stiff right hands, especially on the back end of takedown attempts.

2. He’ll be able to sweep from the bottom. Although McCall managed to take him to the mat several times, Johnson was able to reverse position or immediately get to his feet.

3. He’ll be the aggressor in the fight, and we’ve seen that play a psychological effect on the scoring.

McCall’s upside is harder to quantify because his problems in the first fight weren’t physical. If it’s true that he was distracted and couldn’t get in the fight, and he’s told himself to “shut up and get over it” – as he did in explaining what went wrong the first time around – it could be a completely different fight. But while he was generally outworked in the first and second rounds, but dominated Johnson in the third, the things he did right could play a huge role in the fight. For example:

1. He could prevent Johnson from escaping on the mat. While good at using trips and sweeps to take the fight down, McCall wasn’t able to keep his opponent there until until he had an advantage in stamina. If he can stay on top and work ground and pound, he’ll be ahead on points.

2. He’ll be better on the inside. He frequently was second to engage in the first two frames of the first meeting. When he woke up in the third round, he landed more leg kicks. He landed knees up the middle whenever the two clinched, which further sapped Johnson’s strength. If he gets off first, he’ll be able to use a slight advantage in power and catch Johnson coming in.

Of course, the problems reported by Johnson and McCall may be just a convenient way for both to explain away a less-than-perfect night of work. It’s possible that the rematch won’t change a bit. Johnson’s lapse in cardio was easy to see during the fight. McCall’s mental issues were not. Both, however, were able to get through 15 minutes of high-intensity action, and they’ll no doubt be able to do so again.

Charlie Brenneman (15-3 MMA, 4-2 UFC) vs. Erick Silva (13-2 MMA, 1-1 UFC): Welterweight Silva trains with striking phenoms such as Anderson Silva, but the bulk of his wins come by way of submission. On paper, this looks like a test of how his submission skills stack up against a wrestler such as Brenneman, who’s guaranteed to grind him out from top position if so allowed. But in reality, he’s going to try to keep the fight on its feet and pick apart Brenneman’s still-developing striking game. It could be a quick fight if Brenneman gets caught, but it also could drag if there’s a stalemate.

Josh Neer (33-10-1 MMA, 6-6 UFC) vs. Mike Pyle (22-8-1 MMA, 5-3 UFC): Welterweight Neer stirred the pot at open workouts when he suggested Pyle was heavy and would try to grind out a decision on the mat. But there’s no indication that Pyle wouldn’t do that anyway when faced with the prospect of trading with “honorary Diaz brother” Neer, who comes forward and trades no matter what. Pyle is a better test of Neer’s takedown skills than previous opponents Keith Wisniewski and Duane Ludwig. If he’s able to stay on his feet, Pyle could be in for a long night.

Scott Jorgensen (13-5 MMA, 2-1 UFC) vs. Eddie Wineland (18-8-1 MMA, 0-2 UFC): This is a meeting of two top-10 bantamweights who’ve mirrored each other in falling short to champs and contenders. Wineland’s specialty is his hands, and so he’ll try to make this a striking war. Jorgensen is a better wrestler, and as he previously pointed out, Wineland’s career losses all stem from wrestlers. A loss could be curtains for Wineland, who’s gone 0-2 inside the octagon.

As the UFC 189 tour made its last stop in Dublin, featherweight champ Jose Aldo was met with a torrent of abuse from the Irish fans. It might have been unpleasant, but it might also have been just what he needed.